Reference Standard · Quick Access
UPDATED September 2026
Mathematical Odds & Probability Cheat Sheet
Instant Conversion Matrix: Decimal, Fractional, American, and True Implied Probability Percentages
ODDS CONVERSION MATRIX
| DECIMAL | FRACTIONAL | AMERICAN | IMPLIED WIN % |
|---|---|---|---|
| 1.10 | 1/10 | -1000 | 90.91% |
| 1.25 | 1/4 | -400 | 80.00% |
| 1.50 | 1/2 | -200 | 66.67% |
| 1.75 | 3/4 | -133 | 57.14% |
| 1.80 | 4/5 | -125 | 55.56% |
| 1.90 | 9/10 | -111 | 52.63% |
| 2.00 | 1/1 | +100 | 50.00% |
| 2.25 | 5/4 | +125 | 44.44% |
| 2.50 | 6/4 | +150 | 40.00% |
| 3.00 | 2/1 | +200 | 33.33% |
| 4.00 | 3/1 | +300 | 25.00% |
| 5.00 | 4/1 | +400 | 20.00% |
| 10.00 | 9/1 | +900 | 10.00% |
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